Method and system for detecting life and death state of transmission line by using lightning arrester leakage current

Abstract

A 154kV transmission line life-or-death detection system using lightning arrester leakage current, comprising: a first lightning arrester, a second lightning arrester, and a third lightning arrester each connected to the three phases of a busbar; a first current transformer, a second current transformer, and a third current transformer installed between the first to third lightning arresters and the first ground, the second ground, and the third ground; a transformer connected to the A phase of the busbar to transmit the A phase busbar voltage to the life-or-death detection device; and a life-or-death detection system that divides and receives data from each of the first to third current transformers.

Description

Technology Field

[0001] The present invention relates to a method and system for detecting the live or dead state of a 154kV transmission line. More specifically, the present invention relates to a method and system for detecting the live or dead state of each phase by installing a high-sensitivity instrument current transformer (CT) at the output of each of the three-phase lightning arresters, and to a method and system for determining the live or dead state for each phase by detecting the leakage current at the output of a surge counter or the ground side of the lightning arrester. Background Technology

[0002] Generally, 154kV transmission lines are operated by installing a transformer on only one phase. Then, the live status of all three phases of the transmission line is checked. After connecting the transmission line exclusively to the 154kV busbar, the live status of the busbar transformer at the opposite substation is checked to verify if there is any abnormality in the line.

[0003] Since substation busbar transformers are used, it is essential to switch the transmission line to a de-energized state to verify its life or death status. Additionally, operating substation circuit breakers is required, making preparedness for failures vulnerable. Furthermore, the probability of operational errors increases due to the increased frequency of operations. The problem to be solved

[0004] This invention aims to provide a method for detecting the life or death status of a 154kV transmission line using lightning arrester leakage current. Furthermore, this invention aims to provide a system for detecting the life or death status of a 154kV transmission line using lightning arrester leakage current. means of solving the problem

[0005] A 154kV transmission line life-or-death detection system according to one embodiment of the present invention comprises: i) a first lightning arrester, a second lightning arrester, and a third lightning arrester, each connected to phases A, B, and C of a busbar; ii) a first current transformer, a second current transformer, and a third current transformer installed between the first lightning arrester, the second lightning arrester, and the third lightning arrester, and a first ground, a second ground, and a third ground; iii) a transformer connected to phase A to transmit the voltage of phase A; and iv) a life-or-death detector that receives the busbar voltage from the transformer and receives the data of the first current transformer, the second current transformer, and the third current transformer separately. The first lightning arrester, the second lightning arrester, and the third lightning arrester are each connected to the first ground, the second ground, and the third ground.

[0006] A first surge counter, a second surge counter, and a third surge counter may be installed at the output points of the first lightning arrester, the second lightning arrester, and the third lightning arrester, respectively. The first current transformer, the second current transformer, and the third current transformer may each collect the leakage current of the first lightning arrester, the second lightning arrester, and the third lightning arrester, respectively. A range of leakage current values ​​from 0.1 mA to 10 mA may serve as a criterion for determining liveness. The live / dead detector collects the leakage currents of the first current transformer, the second current transformer, and the third current transformer to determine the liveness status of each of the A-phase, B-phase, and C-phase separately, collects the leakage current of the A-phase from the first current transformer, collects the leakage current of the B-phase from the second current transformer, and collects the leakage current of the C-phase from the third current transformer, and the leakage currents, references, and phase voltages of each of the A-phase, B-phase, and C-phase are input, and the transformer may collect the phase voltage of the A-phase. The live / dead detector includes an A-phase live / dead detector, and the A-phase live / dead detector may include: i) a current magnitude comparison unit that compares the A-phase leakage current with a reference and outputs '1' if the value of the A-phase leakage current is greater than or equal to the reference, and outputs '0' if the value of the A-phase leakage current is less than the reference; ii) a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the voltage of the transformer, and outputs '0' if the bus voltage is less than 80% of the rated voltage; iii) a phase angle comparison unit that determines the A-phase leakage current phase angle of the lightning arrester measured by the first current transformer using the phase angle of the transformer voltage and outputs '1' if the A-phase leakage current phase angle is included within the set phase angle range, and outputs '0' if the A-phase leakage current phase angle is outside the set phase angle range; and iv) a 3-input AND gate that outputs whether the A-phase is live using the outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. The phase angle comparator collects the phase of the transformer voltage and 90 degrees from the phase of the transformer voltage oThe preceding phase can be set as the reference phase of the A-phase leakage current, and an error tolerance range can be set for the reference phase of the A-phase leakage current to provide the above-mentioned phase angle range.

[0007] The live / dead detector includes a B-phase live / dead detector, and the B-phase live / dead detector may include: i) a current magnitude comparison unit that compares the B-phase leakage current with a reference and outputs '1' if the value of the B-phase leakage current is greater than or equal to the reference, and outputs '0' if the value of the B-phase leakage current is less than the reference; ii) a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the transformer voltage, and outputs '0' if the bus voltage is less than 80% of the rated voltage; iii) a phase angle comparison unit that determines the B-phase leakage current phase angle of the lightning arrester measured by the first current transformer using the phase angle of the transformer voltage and outputs '1' if the B-phase leakage current phase angle is included within the set phase angle range, and outputs '0' if the B-phase leakage current phase angle is outside the set phase angle range; and iv) a 3-input AND gate that outputs whether the B-phase is live using the outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. The phase angle comparison unit collects the phase of the transformer voltage and 330 times the phase of the transformer voltage o The preceding phase can be set as the reference phase of the B-phase leakage current, and an error tolerance range can be set for the reference phase of the B-phase leakage current to provide the above-mentioned phase angle range.

[0008] The live / dead detector includes a C-phase live / dead detector, and the C-phase live / dead detector may include: i) a current magnitude comparison unit that compares the C-phase leakage current with a reference and outputs '1' if the value of the C-phase leakage current is greater than or equal to the reference, and outputs '0' if the value of the C-phase leakage current is less than the reference; ii) a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the transformer voltage, and outputs '0' if the bus voltage is less than 80% of the rated voltage; iii) a phase angle comparison unit that determines the phase angle of the C-phase leakage current of the lightning arrester measured by the first current transformer using the phase angle of the transformer voltage and outputs '1' if the C-phase leakage current phase angle is included within the set phase angle range, and outputs '0' if the C-phase leakage current phase angle is outside the set phase angle range; and iv) a 3-input AND gate that outputs whether the C-phase is live using the outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. The phase angle comparison unit collects the phase of the transformer voltage and 210 times the phase of the transformer voltage o The preceding phase can be set as the reference phase of the C-phase leakage current, and an error tolerance range can be set for the reference phase of the C-phase leakage current to set the above-mentioned phase angle range.

[0009] A 154kV transmission line live / dead detection system according to one embodiment of the present invention may further include i) a data unit that collects leakage current from each of a first lightning arrester, a second lightning arrester, and a third lightning arrester and collects the voltage of phase A through a transformer, ii) an A-phase determination unit that determines whether phase A is live, iii) a B-phase determination unit that determines whether phase B is live, and iv) a C-phase determination unit that determines whether phase C is live. The data unit may include i) an A-phase leakage current collection unit that collects the leakage current of the first lightning arrester, ii) a B-phase leakage current collection unit that collects the leakage current of the second lightning arrester, iii) a C-phase leakage current collection unit that collects the leakage current of the third lightning arrester, and iv) a transformer voltage collection unit that collects the voltage of phase A through a transformer. The A-phase leakage current collection unit, the B-phase leakage current collection unit, and the C-phase leakage current collection unit each collect the waveforms of the leakage currents of the A-phase, B-phase, and C-phase, and can collect the phases of the A-phase, B-phase, and C-phase, respectively, from the waveforms of the leakage currents at unit time intervals.

[0010] The transformer voltage collection unit collects the waveform of the A-phase voltage in real time and can collect the phase of the A-phase from the voltage waveform at unit times. The A-phase determination unit may include i) an A-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of the A-phase leakage current with the magnitude of the A-phase leakage current when the line is live, ii) a rated voltage determination unit that determines a normal state or an abnormal state by checking whether the A-phase voltage collected from the transformer is 80% or more of the rated voltage, and iii) an A-phase phase angle comparison unit that determines the normal state or an abnormal state of the leakage current phase by comparing the phase of the A-phase leakage current with the phase of the A-phase voltage. If one or more outputs among the output of the A-phase current magnitude comparison unit, the output of the rated voltage determination unit, and the output of the A-phase phase angle comparison unit are in an abnormal state, the A-phase can be determined as dead. The A-phase phase angle comparison unit is 90 times compared to the A-phase voltage waveform that is the input of the rated voltage determination unit o The current in the preceding state is set as the reference current, and an allowable error range is set for the reference current. If the leakage current of phase A falls within the allowable error range, it is determined to be in a normal state, and if the leakage current of phase A falls outside the allowable error range, it is determined to be in an abnormal state.

[0011] The B-phase judgment unit may include: i) a B-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current in the case of a live state with the magnitude of the B-phase leakage current; ii) a rated voltage judgment unit that determines a normal state or an abnormal state by checking whether the B-phase voltage collected from the transformer is 80% or more of the rated voltage; and iii) a B-phase phase angle comparison unit that determines a normal state or an abnormal state of the leakage current phase by comparing the phase of the B-phase leakage current with the phase of the B-phase voltage. If one or more outputs among the output of the B-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the B-phase phase angle comparison unit are in an abnormal state, the B-phase may be determined as a dead line. The B-phase phase angle comparison unit is 330 compared to the A-phase voltage waveform which is the input of the rated voltage judgment unit o The current in the preceding state is set as the reference current, and an allowable error range is set for the reference current. If the leakage current of phase B falls within the allowable error range, it is determined to be in a normal state, and if the leakage current of phase B exceeds the allowable error range, it is determined to be in an abnormal state.

[0012] The C-phase judgment unit may include: i) a C-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current in the live state with the magnitude of the C-phase leakage current; ii) a rated voltage judgment unit that determines a normal state or an abnormal state by checking whether the C-phase voltage collected from the transformer is 80% or more of the rated voltage; and iii) a C-phase phase angle comparison unit that determines a normal state or an abnormal state of the leakage current phase by comparing the C-phase leakage current phase with the C-phase voltage phase. If one or more outputs among the output of the C-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the C-phase phase angle comparison unit are in an abnormal state, the C-phase may be determined as a dead line. The C-phase phase angle comparison unit is 210 compared to the A-phase voltage waveform which is the input of the rated voltage judgment unit oBased on the current in the preceding state, an allowable error range is set for the reference current; if the leakage current of phase C falls within the allowable error range, it is determined to be in a normal state, and if the leakage current of phase C exceeds the allowable error range, it is determined to be in an abnormal state.

[0013] A 154kV transmission line life-or-death detection system according to one embodiment of the present invention may further include a display unit that visually indicates whether phases A, B, and C are live or faulty according to the outputs of each of the phase A determination unit, phase B determination unit, and phase C determination unit. The display unit may include i) a phase loss indicator that visually indicates whether a phase loss has occurred in the section where the live status is detected, and ii) a phase twist indicator that visually indicates whether a phase twist has occurred within the section where the live status is detected.

[0014] A life-or-death detection method according to one embodiment of the present invention relates to the aforementioned 154kV transmission line life-or-death detection system. The data unit includes an A-phase leakage current collection unit, a B-phase leakage current collection unit, a C-phase leakage current collection unit, and a transformer voltage collection unit. The life-or-death detection method includes i) a first step in which the A-phase leakage current collection unit collects the leakage current of a first lightning arrester, ii) a second step in which the B-phase leakage current collection unit collects the leakage current of a second lightning arrester, iii) a third step in which the C-phase leakage current collection unit collects the leakage current of a third lightning arrester, and iv) a fourth step in which the transformer voltage collection unit collects the A-phase voltage to the transformer.

[0015] In the first step, the A-phase leakage current collection unit collects the waveform and phase of the A-phase leakage current at each unit time, in the second step, the B-phase leakage current collection unit collects the waveform and phase of the B-phase leakage current at each unit time, and in the third step, the C-phase leakage current collection unit collects the waveform and phase of the C-phase leakage current at each unit time. In the fourth step, the transformer voltage collection unit collects the waveform of the A-phase voltage in real time and can collect the phase of the A-phase at each unit time using the voltage waveform.

[0016] The A-phase determination unit may include an A-phase current magnitude comparison unit, a rated voltage determination unit, and an A-phase phase angle comparison unit. A live / dead detection method according to an embodiment of the present invention may further include: i) a fourth step in which the A-phase current magnitude comparison unit determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current when the A-phase current magnitude comparison unit is in a live state with the magnitude of the A-phase leakage current; ii) a fifth step in which the rated voltage determination unit determines a normal state or an abnormal state by checking whether the A-phase voltage collected from the transformer is 80% or more of the rated voltage; iii) a sixth step in which the A-phase phase angle comparison unit determines a normal state or an abnormal state of the leakage current phase by comparing the phase of the A-phase leakage current with the phase of the A-phase voltage; and iv) a seventh step in which the A-phase is determined to be dead if one or more of the outputs of the A-phase current magnitude comparison unit, the output of the rated voltage determination unit, and the output of the A-phase phase angle comparison unit are in an abnormal state. The sixth step comprises: i) 90 compared to the A-phase voltage waveform which is the input of the rated voltage determination unit oThe method may include a step of using the current in the preceding state as a reference current, ii) a step of setting an error tolerance range for the reference current and determining a normal state if the leakage current of phase A falls within the error tolerance range, and iii) a step of determining an abnormal state if the leakage current of phase A falls outside the error tolerance range. The phase B determination unit may include a phase B current magnitude comparison unit, a rated voltage determination unit, and a phase B phase angle comparison unit. A method for detecting life or death according to one embodiment of the present invention may further include: i) a fourth step of determining a normal state or an abnormal state by comparing the magnitude of a preset leakage current when a B-phase current magnitude comparison unit is in a live state with the magnitude of the B-phase leakage current; ii) a fifth step of determining a normal state or an abnormal state by checking whether the B-phase voltage collected from the transformer is 80% or more of the rated voltage; iii) a sixth step of determining a normal state or an abnormal state of the leakage current phase by comparing the phase of the B-phase leakage current with the phase of the B-phase voltage comparison unit; and iv) a seventh step of determining the B-phase as dead if one or more of the outputs of the B-phase current magnitude comparison unit, the output of the rated voltage determination unit, and the output of the B-phase phase angle comparison unit are in an abnormal state.

[0017] Step 6 is, i) 330 compared to the voltage waveform of phase A, which is the input of the rated voltage determination unit o The method may include a step of using the current in the preceding state as a reference current, ii) a step of setting an error tolerance range for the reference current and determining a normal state if the leakage current of phase B falls within the error tolerance range, and iii) a step of determining an abnormal state if the leakage current of phase B falls outside the error tolerance range. The phase C determination unit may include a phase C current magnitude comparison unit, a rated voltage determination unit, and a phase C phase angle comparison unit.

[0018] A method for detecting life or death according to an embodiment of the present invention may further include: i) a fourth step in which a C-phase current magnitude comparison unit determines a normal state or an abnormal state by comparing a preset leakage current magnitude when the C-phase current magnitude is in a live state with the magnitude of the C-phase leakage current; ii) a fifth step in which a rated voltage determination unit determines a normal state or an abnormal state by checking whether the C-phase voltage collected from the transformer is 80% or more of the rated voltage; iii) a sixth step in which a C-phase phase angle comparison unit determines a normal state or an abnormal state of the leakage current phase by comparing the C-phase leakage current phase and the C-phase voltage phase; and iv) a seventh step in which one or more of the outputs of the C-phase current magnitude comparison unit, the output of the rated voltage determination unit, and the output of the C-phase phase angle comparison unit are in an abnormal state. The sixth step comprises: i) 210 compared to the A-phase voltage waveform which is the input of the rated voltage determination unit o It may include a step based on the current in the preceding state, ii) a step of determining a normal state when the leakage current of phase C is within the error tolerance range by setting an error tolerance range for the reference current, and iii) a step of determining an abnormal state when the leakage current of phase C is outside the error tolerance range. Effects of the invention

[0019] By installing current transformers on all three phases to monitor lightning arrester leakage current, phases can be checked more quickly and safely in the event of line disconnection or phase loss. Since all three phases are monitored, it is easy to check each phase by extracting it. Furthermore, phase checking is facilitated even when operating the circuit breaker on the opposite end in a single phase. The reliability of power supply can be improved by minimizing the operation of substation circuit breakers and disconnectors. Brief explanation of the drawing

[0020] FIG. 1 is a schematic diagram of a 154kV transmission line life-or-death detection system using lightning arrester leakage current according to one embodiment of the present invention. FIG. 2 is a schematic diagram of a 154kV transmission line life-or-death detection system using lightning arrester leakage current according to another embodiment of the present invention. FIG. 3 is a configuration diagram of a 154kV transmission line life-or-death detection system using lightning arrester leakage current according to one embodiment of the present invention. FIGS. 4 to 6 are schematic diagrams of a method for detecting the dead or live state of a 154kV transmission line using lightning arrester leakage current according to an embodiment of the present invention. Figure 7 is a schematic diagram of the current magnitude comparison section of Figures 4 to 6. Figure 8 is a schematic graph of the method for comparing phase angles in the phase angle comparison section of Figures 4 to 6. FIG. 9 is a schematic diagram of the AND gate output section of FIGS. 4 to 6. FIG. 10 is a schematic block diagram of a 154kV transmission line life-or-death detection system using lightning arrester leakage current according to one embodiment of the present invention. Figure 11 is a schematic hardware structure diagram of the life-or-death detection system of Figure 10. Specific details for implementing the invention

[0021] Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present disclosure in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0022] In the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Devices constituting a network may be implemented in hardware, software, or a combination of hardware and software.

[0023] Additionally, terms such as "...part," "...unit," and "...module" described in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software.

[0024] The devices described in one embodiment of the present invention are composed of hardware including at least one processor, a memory device, a communication device, etc., and a program that is executed in combination with the hardware is stored in a designated location. The hardware has a configuration and performance capable of executing a method according to one embodiment of the present invention. The program includes instructions that implement an operation method according to one embodiment of the present invention described with reference to the drawings, and executes one embodiment of the present invention in combination with hardware such as a processor and a memory device.

[0025] In this specification, "transmission or provision" may include not only direct transmission or provision but also indirect transmission or provision through other devices or by using an alternative route. Expressions described in the singular in this specification may be interpreted as singular or plural unless explicit expressions such as "one" or "singular" are used. As used in this specification, "land" is interpreted to include islands.

[0026] In this specification, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by these terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component.

[0027] In the flowchart described with reference to the drawings in this specification, the order of operations may be changed, several operations may be merged or some operations may be divided, and certain operations may not be performed.

[0028] FIG. 1 is a schematic diagram of a 154kV transmission line life / dead detection system (100) using lightning arrester leakage current according to one embodiment of the present invention. FIG. 1 is merely for illustrating the present invention and is not limited thereto. Accordingly, FIG. 1 may be modified differently.

[0029] Lightning arresters protect the insulation of equipment connected to the line by discharging abnormal voltages occurring in the line to the ground. They also suppress external abnormal voltages, such as induced lightning, and interrupt follow-up currents.

[0030] Lightning arresters include GAP-type and GAPLESS-type lightning arresters. GAP-type lightning arresters are constructed by including a series GAP and characteristic elements in the arrester device and contain silicon carbide (SiC). Series GAP lightning arresters maintain an insulating state without discharging during normal operation. In the event of an overvoltage, the overvoltage is discharged to the ground, and the follow-up current is interrupted. Silicon carbide suppresses the rise in potential of the lightning arrester during lightning current discharge and prevents insulation breakdown of the arrester itself.

[0031] In other words, the GAP-type lightning arrester suppresses discharge and maintains insulation from the ground under normal conditions, discharging voltage to the ground only when an abnormal voltage occurs. Furthermore, it possesses resistivity characteristics by mixing silicon carbide with multiple compounds. Therefore, for large discharge currents, it discharges with a low resistance value and suppresses the limiting voltage to a low level, while for small discharge currents, it blocks follow-up current with a high resistance value.

[0032] A GAPLESS-type lightning arrester is a lightning arrester without a series gap in the arrester device. The GAPLESS-type arrester includes characteristic elements within the device. Furthermore, the GAPLESS-type arrester uses zinc oxide (ZnO) as its material. Below a specific voltage, almost no current flows. It also interrupts follow-up current by regulating the line voltage. As a higher voltage is applied to zinc oxide, its resistance decreases, making it possible to interrupt follow-up current even without a series gap. In other words, because the GAPLESS-type arrester lacks a series gap, it is compact, lightweight, and has a simple structure. Additionally, since the GAPLESS-type arrester does not have arc discharge, there is no change in characteristic elements due to discharge. However, there is a possibility of ground fault accidents in the event of an internal failure of the arrester.

[0033] Referring to FIG. 1, a first lightning arrester (110), a second lightning arrester (120), and a third lightning arrester (130) are each connected to phases A, B, and C, respectively. More specifically, phases A, B, and C are each connected to the inputs of the first lightning arrester (110), the second lightning arrester (120), and the third lightning arrester (130). The outputs of the first lightning arrester (110), the second lightning arrester (120), and the third lightning arrester (130) are each connected to the first ground (115), the second ground (125), and the third ground (135).

[0034] The first lightning arrester (110) and the first ground (115) are connected by a grounding wire (112). A first current transformer (CT) (140) is connected in the middle of the grounding wire (112). The input and output of the first current transformer (140) are connected to a life detector (170).

[0035] The second lightning arrester (120) and the second ground (125) are connected by a grounding wire (122). A second current transformer (150) is connected in the middle of the grounding wire (122). The input and output of the second current transformer (150) are connected to a life detector (170).

[0036] The third lightning arrester (130) and the third ground (135) are connected by a grounding wire (132). A third current transformer (160) is connected in the middle of the grounding wire (132). The input and output of the third current transformer (160) are connected to a life detector (170).

[0037] A potential transformer (PT) (180) collects the voltage of one of the three phases of the busbar. For example, the transformer (180) collects the voltage of phase A and is connected to the fourth ground (185). Additionally, the transformer (180) transmits the collected voltage to a life detector (170).

[0038] The live / dead detector (170) collects the leakage current of the first lightning arrester (110), the second lightning arrester (120), and the third lightning arrester (130), and the voltage of one phase of the three-phase busbar. The live / dead detector (170) determines whether each phase is in a dead state or a live state. The live / dead detector (170) will be described in more detail later in FIG. 4.

[0039] FIG. 2 is a schematic photograph of a 154kV transmission line life-or-death detection system using lightning arrester leakage current according to another embodiment of the present invention. FIG. 2 is merely for illustrating the present invention and is not limited thereto. Accordingly, FIG. 2 may be modified differently.

[0040] Referring to Fig. 2, the live / dead line or live line is detected by the live / dead line detector of Fig. 2 in the same way as in Fig. 1. In Fig. 1, the live / dead line or live line is detected by the leakage current and voltage on the 154kV side, but in Fig. 2, the leakage current and voltage on both the 154kV side and the busbar side are collected to determine whether the line is live or dead.

[0041] On the transmitting side, leakage current is collected from lightning arresters and one-phase voltage is collected from GIS. On the receiving side, one-phase lightning arrester leakage current and one-phase voltage are collected at the lightning arrester installation point. That is, the leakage current and voltage on the transmitting and receiving sides are collected by a life-and-death detector.

[0042] A first surge counter is installed at the A-phase output of the transmission-side lightning arrester. A first current transformer is installed at the output of the first surge counter, and the first current transformer collects the lightning arrester leakage current and transmits it to a live / dead detector. A second surge counter is installed at the B-phase output of the transmission-side lightning arrester, and a second current transformer is installed at the output of the second surge counter. The second current transformer collects the lightning arrester leakage current and transmits it to a live / dead detector.

[0043] A third surge counter is installed at the C-phase output of the transmission-side lightning arrester, and a third current transformer is installed at the output of the third surge counter. The third current transformer collects the lightning arrester leakage current and transmits it to the life / dead detector. The transformer (PT) installed in the transmission-side GIS collects the voltage of one phase and transmits it to the life / dead detector.

[0044] Micro leakage current always occurs in GAPLESS lightning arresters. Micro leakage current consists mainly of capacitive and resistive currents, but in a normal state lightning arrester, capacitive current accounts for the majority. The magnitude of the capacitive current is approximately 0.2mA to 3mA.

[0045] Surge counters are installed on the grounding wires of lightning arresters in power plants and substations and are current-driven types that operate when a current exceeding a set value flows. Leakage current consists mostly of a fundamental component and is measured as a sinusoidal wave, allowing for the measurement of its magnitude or phase angle.

[0046] The receiving side includes one receiving side transformer and one receiving side lightning arrester. The transmitting side is a power plant or substation, and the receiving side is a point where a lightning arrester is installed at the intermediate or terminal end of the power system transmitted from the power plant or substation. That is, the receiving side transformer is installed on an outdoor steel structure, and the receiving side lightning arrester is installed on the line where the receiving side transformer is installed. A fourth surge counter is installed on the receiving side lightning arrester. Additionally, a current transformer is installed at the output of the fourth surge counter to transmit the leakage current to a live / dead detector.

[0047] FIG. 3 is a configuration diagram of a 154kV transmission line life / death detection system (100) using lightning arrester leakage current according to one embodiment of the present invention. FIG. 3 is merely for illustrating the present invention and is not limited thereto. Accordingly, FIG. 3 may be modified differently.

[0048] Referring to FIG. 3, the life detector (170) included in the life detection system (100) generates a phase A live signal, a phase A dead signal, a phase B live signal, a phase B dead signal, a phase C live signal, a phase C dead signal, a phase twist signal, and a phase loss signal.

[0049] Transformers included in transmission lines collect the voltage of a single phase. For example, the single-phase voltage may be the voltage of Phase A. That is, the phases of Phases B and C can be determined based on the phase of the collected Phase A voltage. The phase angle of the current is determined based on the single-phase voltage of the transformer. Since leakage current is a capacitive current caused by the ground capacitance of the lightning arrester, it is a leading current; based on the phase of the Phase A current, 120 o The phases of phases B and C can be determined based on the difference.

[0050] The current transformers (140, 150, 160) of the lightning arrester grounding wire collect leakage current as detection sensors. The leakage current of the lightning arrester is collected by the first current transformer (140), the second current transformer (150), and the third current transformer (160), which are respectively included in the outputs of the first surge counter, the second surge counter, and the third surge counter. The leakage current collected from all of the A, B, and C phases is transmitted to the live / dead detector (170) to determine the live / dead status of the line. The live / dead status of the line can be determined based on the magnitude of the leakage current. For example, when the transmission line is energized, if the leakage current is 0.2mA to 1mA, it is determined to be in a live state, and if not, it is determined to be a dead line.

[0051] In addition, leakage current judgment criteria can be established according to the condition of the equipment. This determines the life or death status of the line. The range of the phase angle difference used to determine the line's life or death status is set by considering the influence of the resistive current in the lightning arrester.

[0052] For example, if the leakage current of Phase A is greater than the operating value and leads the Phase A voltage by a range calculated by adding or subtracting the allowable tolerance within a 90° phase angle, Phase A is determined to be live. Conversely, if the leakage current of Phase A is less than the operating value or within the range calculated by adding or subtracting the aforementioned allowable tolerance, it is determined to be dead. Meanwhile, if the leakage current of Phase B is greater than the operating value and the phase angle is 330° compared to the Phase B voltage Phase B is determined to be live if it leads by a range calculated by adding or subtracting the allowable tolerance from the leading range. Conversely, if the leakage current of Phase B is below the operating value or within the range calculated by adding or subtracting the aforementioned allowable tolerance, it is determined to be dead. Additionally, if the leakage current of Phase C is greater than or equal to the operating value and the phase angle is 210° compared to the Phase C voltage Phase C is determined to be live if it leads by a margin of error calculated by adding or subtracting the allowable tolerance from the leading range. Conversely, if the leakage current of Phase C is below the operating value or within the aforementioned margin of error, it is determined to be dead.

[0053] Additionally, the life detector (170) can determine whether there is phase twisting and whether there is a phase loss. That is, if the leakage current of one of the three phases is less than the operating value, it is determined to be a phase loss. And if the difference in phase angle is outside the set range, it is determined to be phase twisting. The determination result of the life detector (170) is transmitted to a display unit (350), which is a remote monitor connected via communication.

[0054] The display unit (350) monitors the live / dead status of the three phases of the transmission line and displays it visually. The visual display of the live / dead status is as follows: if phase A is live, a red light is turned on; if phase A is dead, a green light is turned on. If phase B is live, a red light is turned on; if phase B is dead, a green light is turned on. Also, if phase C is live, a red light is turned on; and if phase C is dead, a green light is turned on.

[0055] Additionally, the display unit (350) visually displays an alarm when phase twisting and phase loss occur. The visual alarm includes the type of error determined and the section where the corresponding error occurred. Therefore, the user can respond more quickly.

[0056] FIG. 4 is a schematic diagram of a logic circuit for detecting the dead or live state of a 154kV transmission line using lightning arrester leakage current according to one embodiment of the present invention. The logic circuit of FIG. 4 is merely for illustrating the present invention and is not limited thereto. Accordingly, the logic circuit of FIG. 4 can be modified differently.

[0057] FIG. 4 illustrates an example of a method for detecting the live line of Phase A of a transmission line. The leakage current of Phase A collected from the Phase A transformer of the lightning arrester, the internal setting value, and the phase voltage of the transformer are input. The internal setting value may be 0.1mA to 10mA. The current magnitude comparison unit (210), the rated voltage determination unit (220), and the phase angle comparison unit (230) are composed of circuits.

[0058] Referring to FIG. 4, the A-phase leakage current and the internal set value are input to the current magnitude comparison unit (210). The current magnitude comparison unit (210) outputs '1' if the value of the leakage current is greater than or equal to the internal set value in the life-or-death detector. And if the value of the leakage current is less than the internal set value in the life-or-death detector, it outputs '0'.

[0059] More specifically, the magnitude of the leakage current, which is an analog signal, is converted into a digital signal. The magnitude of the input digital signal is interpreted by a setting method to check the magnitude of the current. That is, if the checked current is greater than or equal to the internal setting value, '1' is output, and if it is less than that, '0' is output.

[0060] The phase voltage of the transformer is input to the rated voltage determination unit (220). The rated voltage determination unit (220) determines that 80% or more of the rated voltage is the rated voltage. That is, the rated voltage determination unit (220) outputs '1' if the phase voltage of the transformer is 80% or more of the rated voltage. Conversely, if the phase voltage of the transformer is less than 80% of the rated voltage, it outputs '0'. For example, if the secondary rated voltage of the transformer is 110V and the input voltage is 88V or more, it corresponds to at least 80%, so it outputs '1'. And if the input voltage of the transformer is less than 88V, it outputs '0'. The rated voltage determination unit (220) converts the analog signal into a digital signal in the same way as the current magnitude comparison unit (210). The secondary voltage of the transformer serves as a reference for measuring the phase angle of the leakage current. That is, when comparing the phase angle using the secondary voltage of the transformer, the normality of the transmission line can be verified. In the event of a transmission line fault or transient condition, low voltage occurs, making it impossible to compare phase angles.

[0061] In the event of a fault in a transmission line, the voltage waveform contains a significant amount of DC and harmonic components due to the reactor and capacitance components of the transmission line. In other words, normal phase angle comparison is impossible. The low voltage is set to 70% of the rated voltage, and the line-to-line voltage is set to 80%.

[0062] The A-phase leakage current and the transformer phase voltage are input to the phase angle comparison unit (230). The phase angle comparison unit (230) collects the phase angle difference between the phase voltage on the secondary side of the transformer and the lightning arrester A-phase leakage current. Since the lightning arrester leakage current is a capacitive current due to ground capacitance, 90 based on the A-phase voltage o This is the preceding leading current. It compares the phase angles of the collected transformer secondary phase voltage and leakage current. If the difference in phase angles is within a preset range, it outputs '1'. Conversely, if the difference in phase angles exceeds the preset range, it outputs '0'.

[0063] Then, the output of the current magnitude comparison unit (210), the output of the rated voltage determination unit (220), and the output of the phase angle comparison unit (230) are input to the 3-input AND circuit (240). As a result, if all inputs of the AND circuit (240) are '1', it is determined that phase A of the transmission line is live.

[0064] FIG. 5 illustrates an example of a method for detecting the live B phase of a transmission line. The B phase leakage current, internal set value, and phase voltage of the transformer collected from the B phase transformer of the lightning arrester are input. Since the rest of FIG. 5 is identical to FIG. 4 except for the calculation in the phase angle comparison unit (230), the detailed description thereof is omitted.

[0065] As illustrated in FIG. 5, the B-phase leakage current and the transformer phase voltage are input to the phase angle comparison unit (230). The phase angle comparison unit (230) collects the phase angle difference between the phase voltage on the secondary side of the transformer and the lightning arrester B-phase leakage current. Since the lightning arrester leakage current is a capacitive current due to ground capacitance, it is 330 times greater than the A-phase voltage waveform based on the B-phase voltage. o Leading current or 30 ° It is a lagging leading current.

[0066] FIG. 6 illustrates an example of a method for detecting live C-phase of a transmission line. The C-phase leakage current, internal setting value, and phase voltage of the transformer collected from the C-phase transformer of the lightning arrester are input. Since the rest of FIG. 6 is identical to FIG. 4 except for the calculation in the phase angle comparison unit (230), a detailed description thereof is omitted.

[0067] As illustrated in FIG. 6, the C-phase leakage current and the transformer phase voltage are input to the phase angle comparison unit (230). The phase angle comparison unit (230) collects the phase angle difference between the phase voltage on the secondary side of the transformer and the leakage current of the lightning arrester B-phase. Since the lightning arrester leakage current is a capacitive current due to ground capacitance, compared to the voltage waveform of the A-phase with respect to the C-phase voltage, 210 o Leading current or 150 ° It is a lagging leading current.

[0068] FIG. 7 is a schematic diagram of the current magnitude comparison unit of FIG. 4 to 6. The current magnitude comparison unit of FIG. 7 is merely for illustrating the present invention and is not limited thereto. Accordingly, the current magnitude comparison unit of FIG. 7 can be modified differently.

[0069] Referring to FIG. 7, a current transformer is installed at the output of the surge counter from the ground wire of the lightning arrester equipped with the surge counter. Scaled analog current is collected through the current transformer. The analog current is input to an ADC (Analog to Digital Converter) to convert it into a digital signal. The collected analog signal is processed by an internal electronic circuit and scaled to DC 4mA to 20mA in proportion to the leakage current, which substantially has a magnitude of 0.1mA to 10mA. It is then converted into a digital signal by an ADC converter.

[0070] FIG. 8 is a graph schematically illustrating a method of comparing phase angles in the phase angle comparison unit (230) of FIG. 4 to 6. More specifically, FIG. 8 (a) shows the phase of the A-phase voltage collected from the transformer and the phases of the A-phase leakage current, B-phase leakage current, and C-phase leakage current measured from a plurality of lightning arresters, and FIG. 8 (b) shows an example of a method for determining the A-phase phase angle, and the indicated phase angle and magnitude are the same as those in FIG. 8 (a). The graph of FIG. 8 is merely for illustrating the present invention and is not limited thereto. Accordingly, the graph of FIG. 8 can be modified differently.

[0071] As shown in FIG. 8(a), the voltage phase of phase A is the secondary voltage phase of the transformer installed on the busbar. That is, the phase of the phase A leakage current of the lightning arrester and 90 o A difference occurs, and the phase of the B-phase leakage current of the lightning arrester is 120 with respect to the phase of the A-phase leakage current. o A difference occurs, and the phase of the C-phase leakage current of the lightning arrester is 120 with the phase of the B-phase leakage current. o A difference occurs.

[0072] As illustrated in FIG. 8(b), the leakage current phase angle of phase A includes both capacitive and resistive currents. That is, exactly 90 with the voltage phase angle of phase A o The difference is not maintained. Therefore, an allowable error range is set and included in the phase angle determination range of the A-phase leakage current of the lightning arrester. Then, similar to the A-phase determination, the phase angles of the B-phase and C-phase are also determined by including the allowable error range.

[0073] FIG. 9 schematically illustrates the output section of the AND circuit of FIGS. 4 to 6. The output section of FIG. 9 is merely for illustrating the present invention and is not limited thereto. Accordingly, the output section of FIG. 9 can be modified differently.

[0074] Referring to FIG. 9, the output of the logic circuits of FIGS. 4 to 6 activates the DO (Digital Output). That is, when it is determined that phase A is live, the DO contact of phase A is determined. Then, if the DO contact is open, phase A is determined to be dead, and if the DO contact is closed, phase A is determined to be live. When it is determined that phase B is live, the DO contact of phase B is determined. Then, if the DO contact is open, phase B is determined to be dead, and if the DO contact is closed, phase B is determined to be live. Meanwhile, when it is determined that phase C is live, the DO contact of phase C is determined. Then, if the DO contact is open, phase C is determined to be dead, and if the DO contact is closed, phase C is determined to be live.

[0075] FIG. 10 is a schematic block diagram of a 154kV transmission line life / dead detection system (100) using lightning arrester leakage current according to one embodiment of the present invention. The life / dead detection system (100) of FIG. 10 is merely for illustrating the present invention and is not limited thereto. Accordingly, the life / dead detection system (100) of FIG. 10 can be modified differently.

[0076] Referring to FIG. 10, the apparatus includes a data unit (310) that collects leakage current from each phase connected to the lightning arrester and collects bus voltage from the bus transformer, an A-phase judgment unit (320) that determines the state of A phase based on the output of the data unit, a B-phase judgment unit (330) that determines the state of B phase based on the output of the data unit, a C-phase judgment unit (340) that determines the state of C phase based on the output of the data unit, and a display unit (350) that displays errors or live line status for each phase.

[0077] The data unit (310) includes an A-phase leakage current collection unit (311) for collecting leakage current flowing to the ground of an A-phase lightning arrester, a B-phase leakage current collection unit (312) for collecting leakage current flowing to the ground of a B-phase lightning arrester, a C-phase leakage current collection unit (313) for collecting leakage current flowing to the ground of a C-phase lightning arrester, and a transformer voltage collection unit (314) for collecting voltage data of a transformer connected to a busbar.

[0078] The A-phase leakage current collection unit (311) collects the leakage current of the lightning arrester connected to the A-phase. The leakage current is collected by a current transformer, and the current transformer is installed in the wire between the surge counter connected to the lightning arrester and the grounding part. The B-phase leakage current collection unit (312) collects the leakage current of the lightning arrester connected to the B-phase. The leakage current is collected by a current transformer, and the current transformer is installed in the wire between the surge counter connected to the lightning arrester and the grounding part. The C-phase leakage current collection unit (313) collects the leakage current of the lightning arrester connected to the C-phase. The leakage current is collected by a current transformer, and the current transformer is installed in the wire between the surge counter connected to the lightning arrester and the grounding part. The transformer voltage collection unit (314) collects the voltage of the transformer installed on the A-phase of the busbar. That is, it collects the voltage phase angle and voltage magnitude of the secondary side of the transformer and transmits the collected voltage phase angle and magnitude to a plurality of judgment units.

[0079] The A-phase judgment unit (320) includes an A-phase current magnitude comparison unit (321) that determines whether the A-phase leakage current is greater than or equal to a preset live-line judgment current, a rated voltage judgment unit (322) that determines whether the voltage is low or normal based on the rated voltage of the transformer voltage, and a phase angle comparison unit (323) that determines the phase angle based on the voltage of the transformer secondary side and the A-phase leakage current.

[0080] The A-phase current magnitude comparison unit (321) collects the A-phase leakage current and compares it with the live-line detection current preset by the live-line detection system. That is, if the A-phase leakage current is greater than or equal to the preset live-line detection current, it outputs a normal state. Conversely, if the A-phase leakage current is less than the preset live-line detection current, it outputs an abnormal state. The live-line detection current can be set to 0.1mA to 10mA. The rated voltage determination unit (322) collects the voltage on the secondary side of the transformer and determines whether the corresponding voltage is 80% or more of the preset rated voltage. That is, if the collected voltage is 80% or more of the rated voltage, it outputs a normal state, and if the collected voltage is less than 80% of the rated voltage, it outputs an abnormal state. The A-phase phase angle comparison unit (323) 90 in the A-phase leakage current phase o The difference in phase angle between the preceding leakage current and the voltage collected from the secondary side of the transformer is collected. If the difference in phase angle falls within a preset range, a normal state is output, and if the difference in phase angle falls outside the preset range, an abnormal state is output.

[0081] The B-phase judgment unit (330) includes a B-phase current magnitude comparison unit (331) that determines whether the B-phase leakage current is greater than or equal to a preset live-line judgment current, a rated voltage judgment unit (332) that determines whether the voltage is low or normal based on the rated voltage of the transformer voltage, and a phase angle comparison unit (333) that determines the phase angle based on the voltage of the transformer secondary side and the B-phase leakage current.

[0082] The B-phase current magnitude comparison unit (331) collects the B-phase leakage current and compares it with a preset live-line detection current. That is, if the B-phase leakage current is greater than or equal to the preset live-line detection current, it outputs a normal state. Conversely, if the B-phase leakage current is less than the preset live-line detection current, it outputs an abnormal state. The preset live-line detection current is 0.1mA to 10mA. The rated voltage determination unit (332) collects the voltage on the secondary side of the transformer and determines whether the corresponding voltage is 80% or greater of the preset rated voltage. That is, if the collected voltage is 80% or greater of the rated voltage, it outputs a normal state, and if the collected voltage is less than 80% of the rated voltage, it outputs an abnormal state. The B-phase phase angle comparison unit (333) 330 in the B-phase leakage current phase o The difference between the voltage phase of the preceding current and the phase angle of the voltage collected from the secondary side of the transformer is collected. Then, if the difference in phase angle falls within a preset range, a normal state is output, and if the difference in phase angle falls outside the preset range, an abnormal state is output.

[0083] The C-phase judgment unit (340) includes a C-phase current magnitude comparison unit (341) that determines whether the leakage current of the C-phase is greater than or equal to a preset live-line judgment current, a rated voltage judgment unit (342) that determines whether the voltage is low or normal based on the rated voltage of the transformer voltage, and a phase angle comparison unit (343) that determines the phase angle based on the voltage of the transformer secondary side and the C-phase leakage current. The C-phase current magnitude comparison unit (341) collects the leakage current of the C-phase and compares it with a preset live-line judgment current. That is, if the leakage current of the C-phase is greater than or equal to the preset live-line judgment current, it outputs a normal state. Conversely, if the leakage current of the C-phase is less than the preset live-line judgment current, it outputs an abnormal state. The preset live-line judgment current may be 0.1mA to 10mA. The rated voltage judgment unit (342) collects the voltage of the transformer secondary side and determines whether the corresponding voltage is greater than or equal to 80% of the preset rated voltage. If the collected voltage is 80% or more of the rated voltage, a normal state is output, and if the collected voltage is less than 80% of the rated voltage, an abnormal state is output. The C-phase phase angle comparison unit (343) is 210 in the leakage current phase of the C-phase. o The difference between the voltage phase of the preceding current and the phase angle of the voltage collected from the secondary side of the transformer is collected. Then, if the difference in phase angle falls within a preset range, a normal state is output, and if the difference in phase angle falls outside the preset range, an abnormal state is output.

[0084] The display unit (350) includes an A-phase live-in indicator (351), a B-phase live-in indicator (352), and a C-phase live-in indicator (353) that indicate the live-in line of each phase based on the output of the A-phase judgment unit, the output of the B-phase judgment unit, and the output of the C-phase judgment unit, a phase failure indicator (354) that indicates a phase failure within a section depending on whether the live-in line of each phase is dead, and a phase twist indicator (355) that indicates a phase twist within a section.

[0085] The A-phase live / dead line indicator (351) displays a live line only when all outputs of the A-phase judgment unit (320) determine a live line. And if any of the outputs of the A-phase judgment unit (320) determine a dead line, it displays a dead line. That is, it visually displays whether a line is live or dead and stores variables such as phase angle and magnitude in the memory of the live / dead line detection system (100).

[0086] The B-phase live / dead line indicator (352) displays a live line only when all outputs of the B-phase judgment unit (330) determine a live line. And if any of the outputs of the B-phase judgment unit (330) determine a dead line, it displays a dead line. That is, it visually displays whether a line is live or dead and stores variables such as phase angle and magnitude in the memory of the live / dead line detection system (100).

[0087] The C-phase live / dead line indicator (353) displays a live line only when all outputs of the C-phase judgment unit (340) determine a live line. And if any of the outputs of the C-phase judgment unit (340) determine a dead line, it displays a dead line. That is, it visually displays whether a line is live or dead and stores variables such as phase angle and magnitude in the memory of the live / dead line detection system (100).

[0088] The phase failure indicator (354) indicates a phase failure when it is determined that at least one of the outputs of the aforementioned A-phase live indicator, B-phase live indicator, and C-phase live indicator is dead within a set section. A phase failure includes cases where the line is not in a live state due to reasons such as a broken transmission line. The phase failure indicator (354) visually displays the phase among the three phases where the phase failure has occurred and the section where the phase failure has occurred. As a result, the user can check the section and take quick action.

[0089] The phase twist indicator (355) indicates a state in which at least one of the three phases is connected in reverse to the connection parts at both ends of the substation. The phase twist is determined by a plurality of phase angle comparison units included in a plurality of judgment units.

[0090] In the phase angle comparison unit (323) of phase A, the phase of the current is 90 o Prior to this, in the B phase angle comparison unit (333), the phase of the current is 330 o As mentioned earlier, in the C phase angle comparison unit (343), the phase of the current is 210 o It precedes. With this feature, the display unit (350) visually indicates whether the current phase of each phase is in the correct position.

[0091] FIG. 11 is a schematic hardware structure diagram of the life-or-death detection system (100) of FIG. 10. FIG. 11 is merely for illustrating the present invention and is not limited thereto. Accordingly, FIG. 11 may be modified differently.

[0092] Referring to FIG. 11, the life-or-death detection system (100) may be implemented as at least one computing device and may execute a computer program containing instructions described to perform operations according to one embodiment. The hardware of the life-or-death detection system (100) includes one or more processors (410), one or more storage (420), one or more memory (430), and one or more communication interfaces (440). These may be connected to each other via a bus. In addition, the life-or-death detection system (100) may include hardware such as input devices and output devices. Furthermore, the life-or-death detection system (100) may be equipped with various software, including an operating system capable of running programs.

[0093] The processor (410) controls the operation of the life-or-death detection system (100) by monitoring voltage fluctuations. The processor (410) may be a processor of various types that processes instructions included in a program. For example, the processor (410) may be a CPU (Central Processing Unit), MPU (Micro Processor Unit), MCU (Micro Controller Unit), GPU (Graphic Processing Unit), etc. Storage (420) stores various data, programs, etc. required to execute an operation according to one embodiment. Memory (430) loads the corresponding program so that instructions described to execute an operation according to one embodiment are processed by the processor (410). For example, memory (430) may be a ROM (read-only memory), RAM (random access memory), etc. The communication interface (440) is a wired / wireless communication module and can be linked with an external database through a wired / wireless network.

[0094] Although embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concepts of the present disclosure as defined in the following claims also fall within the scope of the present disclosure. Explanation of the symbols

[0095] 100. Life and Death Detection System 110, 120, 130. Lightning arrester 112, 122, 132. Grounding wire 115, 125, 135, 185. Grounding 140, 150, 160. Current transformer 170. Life and Death Detector 180. Voice change 210. Current Magnitude Comparison Unit 220. Rated voltage determination unit 230. Phase Angle Comparison Unit 240. 3 Input AND Circuit 310. Data Unit 311. Phase A leakage current collection unit 312. Phase B leakage current collection unit 313. Phase C leakage current collection unit 314. Transformer Voltage Collector 320. Phase A Judgment Unit 321. Phase A Current Magnitude Comparison Unit 322, 332, 342. Rated voltage determination unit 323. Phase Angle Comparison Unit for Phase A 330. Phase B Judgment Unit 331. B-phase current magnitude comparator 333. Phase angle comparison unit for B-phase 340. Phase C Judgment Unit 341. C-phase current magnitude comparison unit 343. C-phase phase angle comparison unit 350. Display Unit 351. A-phase life-and-death indicator 352. Phase B life / death indicator 353. C-phase life / death indicator 354. Image failure indicator 355. Twist indicator 410. Processor 420. Storage 430. Memory 440. Communication Interface

Claims

Claim 1 A first lightning arrester, a second lightning arrester, and a third lightning arrester each connected to phases A, B, and C of a busbar; a first current transformer, a second current transformer, and a third current transformer installed between the first lightning arrester, the second lightning arrester, and the third lightning arrester, and between a first ground, a second ground, and a third ground; a transformer connected to phase A to transmit the voltage of phase A; a live / dead detector that receives the busbar voltage from the transformer and divides and receives data from each of the first current transformer, the second current transformer, and the third current transformer; a data unit that collects leakage current from each of the first lightning arrester, the second lightning arrester, and the third lightning arrester and collects the voltage of phase A through the transformer; an A-phase judgment unit that determines whether phase A is live; a B-phase judgment unit that determines whether phase B is live; and a C-phase judgment unit that determines whether phase C is live, wherein the first lightning arrester, the second lightning arrester, and the third lightning arrester each include the A 154kV transmission line live / dead detection system connected to a first ground, the second ground, and the third ground, wherein the B-phase determination unit includes a B-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current in the case of a live state with the magnitude of the leakage current of the B-phase, a rated voltage determination unit that determines a normal state or an abnormal state by checking whether the voltage of the B-phase collected from the transformer is 80% or more of the rated voltage, and a B-phase phase angle comparison unit that determines a normal state or an abnormal state of the leakage current phase by comparing the phase of the leakage current of the B-phase with the phase of the voltage of the B-phase, and determines the B-phase as dead if one or more of the outputs of the B-phase current magnitude comparison unit, the output of the rated voltage determination unit, and the output of the B-phase phase angle comparison unit are in an abnormal state. Claim 2 A 154kV transmission line life / death detection system according to claim 1, wherein a first surge counter, a second surge counter, and a third surge counter are installed at the output points of the first lightning arrester, the second lightning arrester, and the third lightning arrester, respectively. Claim 3 A 154kV transmission line live / dead detection system according to claim 1, wherein the first current transformer, the second current transformer, and the third current transformer each collect leakage currents of the first lightning arrester, the second lightning arrester, and the third lightning arrester, and the range of the leakage current value being 0.1mA to 10mA is the criterion for determining live line. Claim 4 In paragraph 3, the above-mentioned live / dead detector collects leakage currents of each of the first current transformer, the second current transformer, and the third current transformer to separate and determine the live state of each of the A phase, the B phase, and the C phase, and collects the leakage current of the A phase from the first current transformer, collects the leakage current of the B phase from the second current transformer, and collects the leakage current of the C phase from the third current transformer, and the leakage currents of each of the A phase, the B phase, and the C phase, the reference, and the phase voltages of each phase are input, and the transformer collects the phase voltage of the A phase, thereby forming a 154kV transmission line live / dead detection system. Claim 5 In paragraph 4, the above-mentioned live / dead detector includes an A-phase live / dead detector, and the A-phase live / dead detector comprises: a current magnitude comparison unit that compares the A-phase leakage current with the reference and outputs '1' if the value of the A-phase leakage current is greater than or equal to the reference, and outputs '0' if the value of the A-phase leakage current is less than the reference; a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the voltage of the transformer, and outputs '0' if the bus voltage is less than 80% of the rated voltage; a phase angle comparison unit that determines the A-phase leakage current phase angle of the lightning arrester measured by the first current transformer based on the phase angle of the transformer voltage, outputs '1' if the A-phase leakage current phase angle is included within a set phase angle range, and outputs '0' if the A-phase leakage current phase angle is outside the set phase angle range; and the A-phase live line using the respective outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. A 154kV transmission line life-or-death detection system including a 3-input AND gate that outputs whether. Claim 6 In paragraph 5, the phase angle comparison unit collects the phase of the voltage of the transformer and 90 times the phase of the voltage of the transformer o A 154kV transmission line life-or-death detection system that sets the preceding phase as the reference phase of the A-phase leakage current and sets an error tolerance range for the reference phase of the A-phase leakage current to provide the set phase angle range. Claim 7 In paragraph 4, the above-mentioned live / dead detector includes a B-phase live / dead detector, and the B-phase live / dead detector comprises: a current magnitude comparison unit that compares the leakage current of the B-phase with the reference and outputs '1' if the value of the leakage current of the B-phase is greater than or equal to the reference, and outputs '0' if the value of the leakage current of the B-phase is less than the reference; a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the voltage of the transformer, and outputs '0' if the bus voltage is less than 80% of the rated voltage; a phase angle comparison unit that determines the phase angle of the leakage current of the B-phase of the lightning arrester measured by the first current transformer using the phase angle of the voltage of the transformer, outputs '1' if the phase angle of the leakage current of the B-phase is included within a set phase angle range, and outputs '0' if the phase angle of the leakage current of the B-phase is outside the set phase angle range; and a determination of whether the B-phase is live using the outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. A 154kV transmission line life-or-death detection system including a 3-input AND gate that outputs. Claim 8 In paragraph 7, the phase angle comparison unit collects the phase of the voltage of the transformer and 330 times the phase of the voltage of the transformer o A 154kV transmission line life-or-death detection system that sets the preceding phase as the reference phase of the B-phase leakage current and sets an error tolerance range for the reference phase of the B-phase leakage current to provide the set phase angle range. Claim 9 In paragraph 4, the above-mentioned live / dead detector includes a C-phase live / dead detector, and the C-phase live / dead detector comprises: a current magnitude comparison unit that compares the leakage current of the C-phase with the reference and outputs '1' if the value of the leakage current of the C-phase is greater than or equal to the reference, and outputs '0' if the value of the leakage current of the C-phase is less than the reference; a rated voltage determination unit that outputs '1' if the bus voltage is 80% or more of the rated voltage as the voltage of the transformer, and outputs '0' if the bus voltage is less than 80% of the rated voltage; a phase angle comparison unit that determines the phase angle of the C-phase leakage current of the lightning arrester measured by the first current transformer using the phase angle of the voltage of the transformer, outputs '1' if the phase angle of the C-phase leakage current is included within a set phase angle range, and outputs '0' if the phase angle of the C-phase leakage current is outside the set phase angle range; and a determination of whether the C-phase is live using the outputs of the current magnitude comparison unit, the rated voltage determination unit, and the phase angle comparison unit as inputs. A 154kV transmission line life-or-death detection system including a 3-input AND gate that outputs. Claim 10 In paragraph 9, the phase angle comparison unit collects the phase of the voltage of the transformer and 210 times the phase of the voltage of the transformer o A 154kV transmission line life-or-death detection system that sets the preceding phase as the reference phase of the C-phase leakage current, sets an error tolerance range to the reference phase of the C-phase leakage current, and sets the set phase angle range. Claim 11 delete Claim 12 In claim 1, the data unit comprises a phase A leakage current collection unit for collecting the leakage current of the first lightning arrester, a phase B leakage current collection unit for collecting the leakage current of the second lightning arrester, a phase C leakage current collection unit for collecting the leakage current of the third lightning arrester, and a transformer voltage collection unit for collecting the voltage of the A phase to the transformer, thereby forming a 154kV transmission line life-or-death detection system. Claim 13 In claim 12, the above-mentioned A-phase leakage current collection unit, the above-mentioned B-phase leakage current collection unit, and the above-mentioned C-phase leakage current collection unit each collect the waveforms of the leakage currents of the above-mentioned A-phase, the above-mentioned B-phase, and the above-mentioned C-phase, and collect the phases of the above-mentioned A-phase, the above-mentioned B-phase, and the above-mentioned C-phase each per unit time from the waveforms of the leakage currents, a 154kV transmission line life-or-death detection system. Claim 14 In claim 12, the transformer voltage collection unit collects the waveform of the voltage of phase A in real time and collects the phase of phase A from the waveform of the voltage at unit time intervals, a 154kV transmission line life-or-death detection system. Claim 15 In claim 1, the A-phase judgment unit comprises: an A-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current in the case of a live state with the magnitude of the leakage current of the A-phase; a rated voltage judgment unit that determines a normal state or an abnormal state by checking whether the voltage of the A-phase collected from the transformer is 80% or more of the rated voltage; and an A-phase phase angle comparison unit that determines a normal state or an abnormal state of the leakage current phase by comparing the phase of the leakage current of the A-phase with the phase of the voltage of the A-phase; and a 154kV transmission line live / dead detection system that determines the A-phase as dead when one or more of the outputs of the A-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the A-phase phase angle comparison unit are in an abnormal state. Claim 16 In paragraph 15, the above-mentioned A-phase phase angle comparison unit is 90 times greater than the above-mentioned A-phase voltage waveform, which is the input of the above-mentioned rated voltage determination unit. o A 154kV transmission line life-or-death detection system that sets a current in a preceding state as a reference current, sets an error tolerance range for the reference current, determines a normal state when the leakage current of phase A is included within the error tolerance range, and determines an abnormal state when the leakage current of phase A is outside the error tolerance range. Claim 17 delete Claim 18 In paragraph 1, the B-phase phase angle comparison unit is 330 times the voltage waveform of the A-phase, which is the input of the rated voltage determination unit. o A 154kV transmission line life-or-death detection system that sets a current in a preceding state as a reference current, sets an error tolerance range for the reference current, determines a normal state when the leakage current of phase B is included within the error tolerance range, and determines an abnormal state when the leakage current of phase B is outside the error tolerance range. Claim 19 In claim 1, the C-phase judgment unit comprises: a C-phase current magnitude comparison unit that determines a normal state or an abnormal state by comparing the magnitude of a preset leakage current in the case of a live state with the magnitude of the leakage current of the C-phase; a rated voltage judgment unit that determines a normal state or an abnormal state by checking whether the voltage of the C-phase collected from the transformer is 80% or more of the rated voltage; and a C-phase phase angle comparison unit that determines a normal state or an abnormal state of the leakage current phase by comparing the leakage current phase of the C-phase with the voltage phase of the C-phase; and a 154kV transmission line live / dead detection system that determines the C-phase as dead when one or more of the outputs of the C-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the C-phase phase angle comparison unit are in an abnormal state. Claim 20 In Clause 19, the C-phase phase angle comparison unit is 210 times greater than the A-phase voltage waveform, which is the input of the rated voltage determination unit. o A 154kV transmission line life-or-death detection system that uses a current in a preceding state as a reference, sets an allowable error range for the current based on the reference, determines a normal state when the leakage current of the C phase falls within the allowable error range, and determines an abnormal state when the leakage current of the C phase falls outside the allowable error range. Claim 21 A 154kV transmission line life-or-death detection system according to claim 1, further comprising a display unit that visually displays whether the A phase, the B phase, and the C phase are live or faulty according to the output of each of the A phase judgment unit, the B phase judgment unit, and the C phase judgment unit. Claim 22 In claim 21, the display unit comprises a phase loss indicator that visually indicates whether a phase loss has occurred in the section detecting the live line status, and a phase twist indicator that visually indicates whether a phase twist has occurred within the section detecting the live line status, thereby forming a 154kV transmission line live / dead detection system. Claim 23 A method for detecting the life or death of a 154kV transmission line according to claim 1, wherein the data unit comprises an A-phase leakage current collection unit, a B-phase leakage current collection unit, a C-phase leakage current collection unit, and a transformer voltage collection unit, wherein the transformer voltage collection unit collects the voltage of the A-phase to the transformer, and the method comprises a first step in which the A-phase leakage current collection unit collects the leakage current of the first lightning arrester, a second step in which the B-phase leakage current collection unit collects the leakage current of the second lightning arrester, and a third step in which the C-phase leakage current collection unit collects the leakage current of the third lightning arrester. Claim 24 A method for detecting the life or death of a 154kV transmission line according to claim 23, wherein in the first step, the A-phase leakage current collection unit collects the waveform and phase of the A-phase leakage current at each unit time, in the second step, the B-phase leakage current collection unit collects the waveform and phase of the B-phase leakage current at each unit time, and in the third step, the C-phase leakage current collection unit collects the waveform and phase of the C-phase leakage current at each unit time. Claim 25 In paragraph 23, the transformer voltage collection unit collects the waveform of the voltage of phase A in real time, and collects the phase of phase A from the voltage waveform at unit time intervals, a 154kV transmission line life-or-death detection method. Claim 26 A method for detecting the live or dead status of a 154kV transmission line according to claim 23, wherein the A-phase judgment unit comprises an A-phase current magnitude comparison unit, a rated voltage judgment unit, and an A-phase phase angle comparison unit, and further comprising: a fourth step of determining a normal or abnormal state by comparing the magnitude of a preset leakage current when the A-phase current magnitude comparison unit is in a live state with the magnitude of the leakage current of the A-phase; a fifth step of determining a normal or abnormal state by checking whether the voltage of the A-phase collected from the transformer is 80% or more of the rated voltage by the rated voltage judgment unit; a sixth step of determining a normal or abnormal state of the leakage current phase by comparing the phase of the A-phase leakage current with the phase of the A-phase voltage comparison unit; and a seventh step of determining the A-phase as dead if one or more of the outputs of the A-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the A-phase phase angle comparison unit are in an abnormal state. Claim 27 In paragraph 26, the above 6th step is 90 times the voltage waveform of phase A, which is the input of the above rated voltage determination unit. o A method for detecting the life or death of a 154kV transmission line, comprising the steps of: using a current in a preceding state as a reference current; setting an error tolerance range for the reference current and determining a normal state when the leakage current of phase A is included within the error tolerance range; and determining an abnormal state when the leakage current of phase A is outside the error tolerance range. Claim 28 A method for detecting the live or dead status of a 154kV transmission line according to claim 23, wherein the B-phase judgment unit comprises a B-phase current magnitude comparison unit, a rated voltage judgment unit, and a B-phase phase angle comparison unit; a fourth step of determining a normal or abnormal state by comparing the magnitude of a preset leakage current when the B-phase current magnitude comparison unit is in a live state with the magnitude of the leakage current of the B-phase; a fifth step of determining a normal or abnormal state by checking whether the voltage of the B-phase collected from the transformer is 80% or more of the rated voltage by the rated voltage judgment unit; a sixth step of determining a normal or abnormal state of the leakage current phase by comparing the phase of the B-phase leakage current with the phase of the B-phase voltage comparison unit; and a seventh step of determining the B-phase as dead if one or more of the outputs of the B-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the B-phase phase angle comparison unit are in an abnormal state. Claim 29 In paragraph 28, the above 6th step is 330 times the voltage waveform of phase A, which is the input of the above rated voltage determination unit. o A method for detecting the life or death of a 154kV transmission line, comprising the steps of: using a current in a preceding state as a reference current; setting an error tolerance range for the reference current and determining a normal state when the leakage current of the B phase falls within the error tolerance range; and determining an abnormal state when the leakage current of the B phase falls outside the error tolerance range. Claim 30 A method for detecting the live or dead status of a 154kV transmission line according to claim 23, wherein the C-phase judgment unit comprises a C-phase current magnitude comparison unit, a rated voltage judgment unit, and a C-phase phase angle comparison unit, and further comprising: a fourth step of determining a normal or abnormal state by comparing the magnitude of a preset leakage current when the C-phase current magnitude comparison unit is in a live state with the magnitude of the leakage current of the C-phase; a fifth step of determining a normal or abnormal state by checking whether the voltage of the C-phase collected from the transformer is 80% or more of the rated voltage by the rated voltage judgment unit; a sixth step of determining a normal or abnormal state of the leakage current phase by comparing the phase of the C-phase leakage current with the phase of the C-phase voltage comparison unit; and a seventh step of determining the C-phase as dead if one or more of the outputs of the C-phase current magnitude comparison unit, the output of the rated voltage judgment unit, and the output of the C-phase phase angle comparison unit are in an abnormal state. Claim 31 In Clause 30, the 6th step is 210 times the voltage waveform of phase A, which is the input of the rated voltage determination unit. o A method for detecting the life or death of a 154kV transmission line, comprising: a step of determining a normal state when the leakage current of the C phase falls within the error tolerance range based on the current based on the preceding state, and a step of determining an abnormal state when the leakage current of the C phase falls outside the error tolerance range.

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